Charles Lecocq's 'Ali-Baba' is likely a lively and theatrical piece, reflecting his background in operetta. It would feature charming melodies and a generally lighthearted, comedic character.
Precise articulation and a sense of rhythmic buoyancy are essential for conveying the piece's character.
Ali-Baba is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ali-Baba lasts about 3 minutes.
Ali-Baba is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.